G 1265 (OTTO) Germanium, powder, 99.9% Cas 7440-56-4 - used to make substrate of the wafers for high-efficiency multijunction photovoltaic cells for space applications. High-brightness LEDs, used for automobile headlights and to backlight LCD screens, are an important application. G 1265 (OTTO) Germanium, powder, 99.9% Cas 7440-56-4 - used for polymerization catalysts and have most recently found use in the production of nanowires.